MCP23017-E/SS

I/o Expanders Overview

The MCP23017-E/SS is a 16-bit I/O expander featuring an I2C interface in a 28-pin SSOP package. It provides two 8-bit ports (PORTA and PORTB) with configurable direction, polarity inversion, and interrupt-on-change capabilities. The device supports I2C clock frequencies of 100 kHz, 400 kHz, and up to 1.7 MHz. Operating voltage ranges from 1.8 V to 5.5 V, with a maximum standby current of 1 µA. Each I/O pin can sink or source up to 25 mA. It includes three hardware address pins for bus expansion, external reset input, and ESD protection rated at 4 kV.

I/o Expanders Feature Summary

• Provides 16 bidirectional I/O pins divided into two independent 8-bit ports.
• Supports high-speed I2C communication with configurable clock speeds.
• Features configurable interrupt outputs triggered by pin state changes or register defaults.
• Includes internal weak pull-up resistors and polarity inversion registers.

I/o Expanders Applications

• Embedded systems requiring GPIO expansion via I2C bus
• Industrial control interfaces and sensor arrays
• Consumer electronics with limited microcontroller pins

I/o Expanders Procurement Notes

Verify the ordering suffix matches the required package type and temperature grade. Confirm RoHS compliance status through official Microchip documentation. Ensure the specific revision level aligns with design requirements. Check for moisture sensitivity classification if lead-free soldering processes are utilized. Validate that the SSOP-28 footprint corresponds to the target PCB layout specifications.

I/o Expanders Selection Notes

Select this component when an I2C interface is preferred over SPI for system connectivity. Choose the SSOP package for surface-mount applications requiring a compact form factor. Ensure the host controller supports the desired I2C speed mode, particularly if operating above 400 kHz. Verify that the supply voltage range meets the application's power constraints.

I/o Expanders Part Context

This part belongs to the MCP23X17 family, which also includes the SPI-based MCP23S17. The primary distinction lies in the serial interface protocol. Other variants in the series offer different packaging options such as SOIC, SPDIP, and QFN. The 'E' suffix typically denotes extended industrial temperature range performance.

I/o Expanders Replacement Considerations

Direct functional substitutes include other MCP23017 variants with different packages, such as MCP23017-E/SO or MCP23017-E/SP. Cross-family replacements like the PCF8574 require significant software and hardware redesign due to differing interface protocols and register maps.